Alert archive / North Carolina / Flash Flood Warnings in 2017

Flash Flood Warning 9, NWS Raleigh, NC

June 19, 20174 counties in North Carolina

NWS Raleigh, NC issued this flash flood warning at Jun 19, 2017, 11:39 PM EDT for 4 counties in North Carolina. It was in force for 4 hr. 5 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jun 19, 2017, 11:39 PM EDT (03:39 UTC)
Expired: Jun 20, 2017, 3:15 AM EDT
In force: 4 hr
Issued by: NWS Raleigh, NC
Area: Storm-based polygon
Flood severity: None

Counties Alamance County, NC, Durham County, NC, Granville County, NC, Orange County, NC

The radar

The Raleigh/Durham radar (KRAX), 54 km from the middle of the area, began a volume at 03:41 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Jun 20, 12:30 AM EDT	FLASH FLOOD	2 Sse Mebane, NC	WATER OVER BEN WILSON RD NEAR BOWMAN RD IN MEBANE. CREWS HEADING OUT TO CLOSE ROAD.
Jun 20, 12:30 AM EDT	FLASH FLOOD	3 Sse Mebane, NC	WATER OVER BEN WILSON RD NEAR BOWMAN RD IN MEBANE. CREWS HEADING OUT TO CLOSE ROAD.
Jun 20, 12:45 AM EDT	FLASH FLOOD	Hillsborough, NC	CAR STRANDED AND ROAD REMAINS CLOSED AT ENO ST. AND DIMMOCKS MILL RD.
Jun 20, 12:57 AM EDT	FLASH FLOOD	1 W Hillsborough, NC	ROAD CLOSURE AT DIMMOCKS MILL RD. AND WEST HILL AVE.
Jun 20, 1:15 AM EDT	FLASH FLOOD	4 Sse Mebane, NC	HIGH WATER AND FLOODING AT 2700 MEBANE OAKS RD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 3.7 hours before the alert went out and 92 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1212 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 1136 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 128 m²/s²
0-3 km storm-relative helicity: 165 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 7.4

Open this sounding in Storm Lab

The text

As transmitted.

890 
WGUS52 KRAH 200339
FFWRAH
NCC001-063-077-135-200715-
/O.NEW.KRAH.FF.W.0009.170620T0339Z-170620T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Raleigh NC
1139 PM EDT MON JUN 19 2017

The National Weather Service in Raleigh has issued a

* Flash Flood Warning for...
  Alamance County in central North Carolina...
  Orange County in central North Carolina...
  Southern Granville County in central North Carolina...
  Durham County in central North Carolina...

* Until 315 AM EDT
  
* At 1138 PM EDT, Doppler radar indicated a thunderstorm producing 
  heavy rain across the warned area. UOne to three inches of rain 
  has fallen. An additional one to twi inches will be possible. 
  Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Durham, Chapel Hill, Burlington, Graham, Oxford, Hillsborough,
  Creedmoor, Carrboro, Mebane and Butner.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Excessive runoff from the heavy rain will cause flash flooding of
creeks and streams, roads, low lying and poor drainage areas. Do not
drive your vehicle into areas where water covers the road. Many roads
and intersections in the area will quickly flood. When encountering
flooded roads, turn around, don't drown.

&&

LAT...LON 3617 7850 3608 7854 3602 7855 3608 7869
      3607 7875 3603 7875 3601 7870 3598 7871
      3592 7876 3592 7881 3587 7883 3586 7909
      3588 7925 3585 7924 3584 7954 3585 7954
      3624 7953 3624 7880 3626 7880 3637 7851

$$

26

2 follow-up statements

484 
WGUS72 KRAH 200411
FFSRAH

Flash Flood Statement
National Weather Service Raleigh NC
1211 AM EDT TUE JUN 20 2017

NCC001-063-077-135-200715-
/O.CON.KRAH.FF.W.0009.000000T0000Z-170620T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Alamance NC-Orange NC-Granville NC-Durham NC-
1211 AM EDT TUE JUN 20 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 AM EDT FOR
ALAMANCE...ORANGE...SOUTHERN GRANVILLE AND DURHAM COUNTIES...

At 1209 AM EDT, Doppler radar indicated thunderstorms that were
continuously redeveloping and producing flooding over the warned 
area. Up to three inches of rain have already fallen, including a 
storm total measurement of almost 2.75 inches at the Burlington-
Alamance Regional Airport. Flash flooding is expected to 
continue in many areas, and begin shortly in others.

Some locations that will experience flooding include...
Durham, Chapel Hill, Burlington, Graham, Oxford, Hillsborough,
Creedmoor, Carrboro, Mebane and Butner.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Excessive runoff from the heavy rain will cause flash flooding of
creeks and streams, roads, low lying and poor drainage areas. Do not
drive your vehicle into areas where water covers the road. Many roads
and intersections in the area will quickly flood. When encountering
flooded roads, turn around, don't drown.

&&

LAT...LON 3617 7850 3608 7854 3602 7855 3608 7869
      3607 7875 3603 7875 3601 7870 3598 7871
      3592 7876 3592 7881 3587 7883 3586 7909
      3588 7925 3585 7924 3584 7954 3585 7954
      3624 7953 3624 7880 3626 7880 3637 7851

$$

26

252 
WGUS72 KRAH 200439
FFSRAH

Flash Flood Statement
National Weather Service Raleigh NC
1239 AM EDT TUE JUN 20 2017

NCC001-063-077-135-200715-
/O.CON.KRAH.FF.W.0009.000000T0000Z-170620T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Alamance NC-Orange NC-Granville NC-Durham NC-
1239 AM EDT TUE JUN 20 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 AM EDT FOR
ALAMANCE...ORANGE...SOUTHERN GRANVILLE AND DURHAM COUNTIES...

At 1234 AM EDT, local law enforcement reported water on numerous 
roads across the warned area and a number of roads in Alamance and 
Orange counties have been closed. Up to three inches of rain have 
fallen over the past 3 hours, and an additional 1 to 2 inches are 
possible as heavy downpours continue to move northeast across the 
area.

Some locations that will experience flooding include...
Durham, Chapel Hill, Burlington, Graham, Oxford, Hillsborough,
Creedmoor, Carrboro, Mebane and Butner.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the 
dangers of flooding. Turn around, don't drown when encountering 
flooded roads. Most flood deaths occur in vehicles.

Do not drive your vehicle into areas where water covers the road. 
Many roads and intersections in the area are flooded. When 
encountering flooded roads, turn around, don't drown.

&&

LAT...LON 3617 7850 3608 7854 3602 7855 3608 7869
      3607 7875 3603 7875 3601 7870 3598 7871
      3592 7876 3592 7881 3587 7883 3586 7909
      3588 7925 3585 7924 3584 7954 3585 7954
      3624 7953 3624 7880 3626 7880 3637 7851

$$

13

The office that day

Everything else NWS Raleigh, NC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 19, 8:41 PM EDT	Special Weather Statement	RAH	Alamance, Granville, Guilford, Orange, Person, Vance	64 min
Jun 19, 8:55 PM EDT	Areal Flood Advisory	RAH	Alamance, Durham, Forsyth, Granville, Guilford, Orange and 2 more	6 hr
Jun 19, 9:07 PM EDT	Flash Flood Warning	RAH	Granville, Person	3 hr
Jun 19, 9:19 PM EDT	Special Weather Statement	RAH	Warren	56 min
Jun 19, 9:30 PM EDT	Severe Thunderstorm Warning	RAH	Durham, Granville, Orange, Wake	60 min
Jun 19, 9:40 PM EDT	Special Weather Statement	RAH	Anson, Richmond	65 min
Jun 19, 9:58 PM EDT	Flash Flood Warning	RAH	Guilford	3 hr
Jun 19, 10:14 PM EDT	Special Weather Statement	RAH	Alamance	46 min
Jun 19, 10:18 PM EDT	Severe Thunderstorm Warning	RAH	Anson, Montgomery, Richmond, Stanly	57 min
Jun 19, 10:47 PM EDT	Areal Flood Advisory	RAH	Anson	3 hr
Jun 19, 11:34 PM EDT	River Flood Warning	RAH	Alamance	29 hr
Jun 19, 11:55 PM EDT	Flash Flood Warning	RAH	Davidson, Guilford, Randolph	3 hr
Jun 20, 12:16 AM EDT	Areal Flood Advisory	RAH	Chatham, Edgecombe, Franklin, Granville, Halifax, Nash and 3 more	3 hr
Jun 20, 1:00 AM EDT	Flash Flood Warning	RAH	Guilford	2 hr
Jun 20, 1:22 AM EDT	Special Weather Statement	RAH	Chatham	53 min
Jun 20, 3:03 AM EDT	Areal Flood Warning	RAH	Alamance, Davidson, Durham, Granville, Guilford, Orange and 1 more	3 hr
Jun 20, 6:14 AM EDT	Special Weather Statement	RAH	Cumberland, Harnett, Hoke, Johnston, Sampson, Wayne	91 min
Jun 20, 8:00 AM EDT	Special Weather Statement	RAH	Cumberland, Hoke, Wayne	90 min
Jun 20, 8:09 AM EDT	Areal Flood Advisory	RAH	Cumberland	111 min
Jun 20, 8:32 AM EDT	River Flood Warning	RAH	Chatham	40 hr

Nearby

Flash Flood Warnings in North Carolina, 2017 Every flash flood warning in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.